Most episodes of neck pain are caused by mechanical disorders associated with gradual changes associated with aging, or with overuse of the neck or arms. About 10% of instances of neck pain are associated with systemic illnesses, such as polymyalgia rheumatica.
Muscle strains usually related to sustained physical activity such as sitting at computer terminals for prolonged periods of time. Acute strain may occur after sleeping in an awkward position.
Osteoarthritis resulting from the narrowing of the intervertebral discs located between the vertebrae of the spine. The adjacent vertebrae grow spurs in response to the increasing pressure placed on them. The bony growths can cause localized pain in the neck or arm related to nerve compression. For the complete list:
http://www.rheumatology.org/public/factsheets/neckpa... Hope this helps.